cats effect IO whenA

kaichaosun · May 6, 2019 · d227bc6 · d227bc6
1 parent dfbd812
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diff --git a/README.md b/README.md
@@ -71,6 +71,12 @@ This book is aimed to be the first place when you starting functional programmin
       * [Why variance](#why-variance)
 * [References](#references)
 
+## Functional Programming Introduction
+
+### Whats FP
+
+### Why FP
+
 ## Setup
 
 ### Install Java 8 JDK

diff --git a/example/scala-walk-through/src/main/scala/example/catseffect/IOWhenA.sc b/example/scala-walk-through/src/main/scala/example/catseffect/IOWhenA.sc
@@ -0,0 +1,6 @@
+import cats.effect.IO
+import cats.implicits._
+
+val program = IO{ println("hello") }.whenA(false)
+
+program.unsafeRunSync()
diff --git a/example/scala-walk-through/src/main/scala/example/fs2/StreamChunk.sc b/example/scala-walk-through/src/main/scala/example/fs2/StreamChunk.sc
@@ -0,0 +1,11 @@
+import fs2.Chunk
+import fs2.Stream
+
+val s1c = Stream.chunk(Chunk.doubles(Array(1.0, 2.0, 3.0)))
+
+s1c.mapChunks{
+  chunk =>
+    val doubles = chunk.toDoubles
+    println(doubles.values.size)
+    doubles
+}